MXR Uni-Vibe® Chorus/Vibrato. Delivers the same chewy, Leslie-sounding goodness but with a smaller footprint. The Vibe switch selects either Chorus Mode - dry signal mixed with pitch-shifted signal - or Vibrato Mode - only pitch-shifted signal. Then, use the level control to set the effect volume, the speed control to set the sweep rate and the depth control to set overall intensity. Heavy-duty Phase 90 sized housing perfect for taking this lush, swirly pedal out on the road. True bypass. Powered by 9-volt battery or AC adaptor (ECB003).